diff --git a/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java b/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java
index 3dbcd14129f63..3ef9aaad98233 100644
--- a/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java
+++ b/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java
@@ -653,7 +653,7 @@ public void testLookupExplosionManyMatches() throws IOException {
     }
 
     public void testLookupExplosionNoFetch() throws IOException {
-        int sensorDataCount = 7000;
+        int sensorDataCount = 6000;
         int lookupEntries = 10000;
         Map<?, ?> map = lookupExplosionNoFetch(sensorDataCount, lookupEntries);
         assertMap(map, matchesMap().extraOk().entry("values", List.of(List.of(sensorDataCount * lookupEntries))));